The status of the development of a new concentrator module in Japan is discussed based on three arguments, performance, reliability and cost. We have achieved a 26Á6% peak uncorrected efficiency from a 7056 cm 2 400Â module with 36 solar cells connected in series, measured in house. The peak uncorrected efficiencies of the same type of the module with 6 solar cells connected in series and 1176 cm 2 area measured by Fraunhofer ISE and NREL are reported as 27Á4% and 24Á8% respectively. The peak uncorrected efficiency for a 550Â and 5445 cm 2 module with 20 solar cells connected in series was 28Á9% in house. The temperature-corrected efficiency of the 550Â module under optimal solar irradiation condition was 31Á5 AE 1Á7%. In terms of performance, the annual power generation is discussed based on a side-by-side evaluation against a 14% commercial multicrystalline silicon module. For reliability, some new degradation modes inherent to high concentration III-V solar cell system are discussed and a 20-year lifetime under concentrated flux exposure proven. The fail-safe issues concerning the concentrated sunlight are also discussed. Moreover, the overall scenario for the reduction of material cost is discussed.

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